CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Stockholders’ equity:
Preferred stock Series A-2, convertible, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock Series A-2, convertible, stated value	$ 7,500	$ 7,500
Preferred stock Series A-2, convertible, shares authorized (in shares)	7,500	7,500
Preferred stock Series A-2, convertible, shares issued (in shares)	32	32
Preferred stock Series A-2, convertible, shares outstanding (in shares)	32	32
Preferred stock Series A-2, convertible, liquidation value	$ 237,000	$ 237,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	36,782,000	36,659,000
Common stock, shares outstanding (in shares)	36,535,000	36,455,000
Treasury stock, shares (in shares)	247,000	204,000